/Engine/Plugins/Online/OnlineSubsystemUtils/Source/OnlineSubsystemUtils/Public/PartyBeaconHost.h
Updates an existing party reservation on the beacon An existing reservation for this party leader must already exist
update attempt result
virtual [EPartyReservationResult::Type](API\Plugins\OnlineSubsystemUtils\EPartyReservationResult__Type) UpdatePartyReservation ( const [FPartyReservation](API\Plugins\OnlineSubsystemUtils\FPartyReservation) & ReservationUpdateRequest, bool bIsRemovingMembers )